Do glycols ruin emulsion stability?

Several tech papers suggest so
Like this one where there's a clear separation with increasing glycol concentration

My experiments also seem to show propylene glycol ruining emulsion stability.


  • BelassiBelassi Member, PCF student
    I've never had a problem and I use it as reinforcement for the preservative system.  I suppose it depends on your emulsification system. 
    Quite frankly this article (link) was useless to me. The minimal information given says nothing about the emulsifer except that it was a 'non ionic surfactant'. Hell, that could be glyceryl stearate or it could be CAPB for all we know. And, emulsifying paraffin?? That is not representative of anything I am interested in.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • I can’t see how much they used. My anecdotal evidence suggests it’s the other way around. Glycols are much less problematic than some other humectants.
  • Post ingredients and percentages, without a good emulsifier that would happen
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